Compilare: main.cpp: In function 'int main()': main.cpp:80:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(val[var[i]]==0) ^ main.cpp:81:23: warning: array subscript has type 'char' [-Wchar-subscripts] val[var[i]]=1; ^ main.cpp:83:23: warning: array subscript has type 'char' [-Wchar-subscripts] val[var[i]]=0; ^ main.cpp: In function 'int eval(int, int, char)': main.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type] } ^